High School

After you have coupled a tractor to a trailer, you should always do which of the following:

A. Make sure that the trailer brakes are working by pulling forward and pulling out the trailer air supply valve to ensure the trailer brakes engage.

B. Ensure that the jaws have locked around the kingpin by releasing the tractor parking brake and pulling against the trailer.

C. Both of the above answers are correct.

Answer :

Final answer:

After coupling a tractor to a trailer, you should always make sure the trailer brakes are working and that the jaws have locked around the kingpin. option c, both of the above answers are correct.

Explanation:

After coupling a tractor to a trailer, you should always do the following:

Make sure that the trailer brakes are working by pulling forward and pulling out the trailer air supply valve to make sure that the trailer brakes come on.

Make sure that the jaws have locked around the king pin by releasing the tractor parking brake and pulling against the trailer.

Therefore, option c, both of the above answers are correct.

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